Howdy, On Wed, Aug 14, 2013 at 9:40 AM, Bert Gunter <gunter.ber...@gene.com> wrote: > mod Jeff Newmiller's comments... > > 1. Have you read"An Introduction to R? (or other basic tutorial -- > there are many on the web). If no, stop posting and do so. This will > help you to understand R's basic data manipulation capabilities and > structures (list, "apply" type functions,...). > > 2. mod 1), perhaps > > ?tapply (and friends like ?ave, ?aggregate, ?by) > ?split
... and after you've discovered the existence and explored the functionality of these functions, run (don't walk) over to check out the plyr package: http://plyr.had.co.nz And read through this relevant chapter in Hadley's book: https://github.com/hadley/devtools/wiki/functionals#data-structure-functionals It will take you through looping, to *apply-ing, to plyr-ing HTH, -steve -- Steve Lianoglou Computational Biologist Bioinformatics and Computational Biology Genentech ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
